package com.nekoneko.nekonekodemo;

import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by 想法的猫 on 2017/12/5 0005.
 */

public class DownloadUtils {
    /**
     * 从网络Url中下载文件
     *
     * @param urlStr
     * @param fileName
     * @param savePath
     * @throws IOException
     */
    public static void downLoadFromUrl(String urlStr, String fileName, String savePath, final DownloadCallBack callBack) {
        try {

            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            //设置超时间为3秒
            conn.setConnectTimeout(3 * 1000);
            //防止屏蔽程序抓取而返回403错误
            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            long fileSize = conn.getContentLength();
            Log.d("readInputStream", "fileSize=" + fileSize);
            //得到输入流
            InputStream inputStream = conn.getInputStream();
            //获取自己数组
            byte[] getData = readInputStream(inputStream, fileSize, callBack);

            //文件保存位置
            File saveDir = new File(savePath);
            if (!saveDir.exists()) {
                saveDir.mkdir();
            }
            File file = new File(saveDir + File.separator + fileName);
            if (!file.exists()) {
                file.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(getData);
            if (fos != null) {
                fos.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }
        } catch (IOException o) {
            o.printStackTrace();
            App.mMainHandler.post(new Runnable() {
                @Override
                public void run() {
                    callBack.onFailed();
                }
            });
        }
    }

    public static byte[] readInputStream(InputStream inputStream, final long fileSize, final DownloadCallBack callBack) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        long currentSize = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
            currentSize += len;
            final long finalCurrentSize = currentSize;
            App.mMainHandler.post(new Runnable() {
                @Override
                public void run() {
                    callBack.onProcess((int) (finalCurrentSize * 100 / fileSize));
                }
            });
        }
        bos.close();
        App.mMainHandler.post(new Runnable() {
            @Override
            public void run() {
                callBack.onDone();
            }
        });
        return bos.toByteArray();
    }

    public interface DownloadCallBack {
        void onProcess(int process);

        void onDone();

        void onFailed();
    }
}
